<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            background: red;
        }
        p{
            width: 100px;
            height: 100px;
            background: #2fff3d;
        }
    </style>
</head>
<body>

<!--1, 标签选择器: 通过标签名, 把css样式和html代码关联起来-->
    <div>
        div
    </div>
    <p>
        p
    </p>
    <p>
        p
    </p>



</body>
</html>
